Arlington County, or simply Arlington, is a county in the U.S. state of Virginia. The county is located in Northern Virginia on the southwestern bank of the Potomac River directly across from Washington, D.C., the national capital. Arlington County is coextensive with the U.S. Census Bureau's census-designated place of Arlington. Arlington County is the eighth-most populous county in the Washington metropolitan area with a population of 238,643 as of the 2020 census. If Arlington County were incorporated as a city, it would rank as the third-most populous city in the state. With a land area of 26 square miles, Arlington County is the geographically smallest self-governing county in the nation. Arlington County is home to The Pentagon, the world's second-largest office structure, which houses the headquarters of the U.S. Department of Defense. Other notable locations are DARPA, the Drug Enforcement Administration's headquarters, Reagan National Airport, and Arlington National Cemetery.

Founded: February 27, 1801
Named for: Arlington House
Total: 26 sq mi (67.34 km²)
Land: 26 sq mi (67.34 km²)
Water: 0.2 sq mi (0.52 km²), 0.4
Time zone: Eastern: UTC-5-4
Official Website: https://www.arlingtonva.us/
Wikidata description: county in Virginia, United States; part of Washington metropolitan area
Wikidata id: Q107126
Wikidata label: Arlington County
Wikidata aliases: Array
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